I'm mostly looking for setup advise and pointers on how to go about going about this. I'll explain in as much detail as I can think and also note possible approaches that may be plausible. The aim of this is to create a real time browser game, the best method that I have found for my needs would to use "long polling" with ajax, which wi...
I receive from the httpservice with a certain frequency a string like this: 1#3#234525234 where row#column#value I want to display into datagrid the above string at real time; at the moment my code displays the whole string, composed by many strings like the one above. How can i solve the problem? Thanks in advance I have the following ...
What is the shortest interval at which RT Linux can execute a (real-time) periodic task? I'm investigating hardware vs. software solutions for a scientific data acquisition app. The requirements include real-time feedback control of physiological processes at approximately 40kHz. There are hardware solutions (using programable DSP chips...
I have a process that builds a list from a database table and runs real time. Every now and then new data gets added to the database table. Querying data from the table every now and then is cumbersome, and time consuming, and this need to be as real time as possible.What is the right way to approach the problem? The process is as follo...
Hello all, Does anyone have any experience with receiving and updating a large volume of data, storing it, sorting it, and visualizing it very quickly? Preferably, I'm looking for a .NET solution, but that may not be practical. Now for the details... I will receive roughly 1000 updates per second, some updates, some new rows of data ...
Hi all, I started now with Pubsubhubbub (and all about realtime things), but I having trouble with the Subscriber option. I'm trying to develop a webapp in PHP to: Subscribe a RSS (previously Published) to the Hub (http://pubsubhubbub.appspot.com/); Read notifications (updates) from the Hub for the subscription; without succeed!!! :(...
Hi I'm looking for a control with the following functionality, to be used in realtime protocol development. The control would record a number of timed values (The threshold) over a specific period (the window). So setting threshold=3 window=10. Sending 3 timed values to the control over 10 seconds would return true overwise return f...
I have been given the task to fix an Embedded Operating System which is written in C/C++. The Current thread scheduler being used is very similar to Round Robin Scheduling, except it lacks one very important feature, the ability to interrupt threads and then return executing thus creating a dependable "slice" of execution time. My Qu...
I'm seeking for an algorithm to layout rectangle windows, the requirements are like below: All windows to be layout can be seen as small rectangles. All windows must be layout in a rectangle 2D display, and the display width and height is given. There are several dozen windows to be layout. Each window has an initial position (x,y) and...
Hi, I want to create a FLV stream generated from images taken from my directx application, to end up on a webpage. My current plan is (have been) to send screenshots as JPG:s from the dx app, to a client running on Linux. This client converts the JPG:s to a MJPEG stream. And ffmpeg converts the MJPEG stream to FLV - ending up in Flash P...
I'm wondering if anyone knows of a place on the web that I can purchase or download software modules, written in C or C++, for the interaction between microprocessors and other components, like DACs, ADCs, or UARTs. Sort of like a git-hub for embedded C software. Does this place exist? ...
I trying to make a realtime stats bar. And I think of using the Long Polling concept. But when a request is send to php. I need a way of testing if the stats are updated. Now I can just make a loop with a database query, and test it. But that just doesn't seem right to me :) Is there a more inexpensive method of testing the database f...
(I'm using C# but this isn't necessarily platform-specific) Say I have a table of values, which are indexed by a triplet of keys (A, B, C). The values in the table are streaming in from an outside source at sporadic intervals. I want to publish aggregates over various sets of keys, e.g. calculate a sum over all values where B = b1. Thi...
Hi, Firstly I'm an engineer, not a computer scientist, so please be gentle. I currently have a C++ program which uses MySQL++. The program also incorporates the NI Visa runtime. One of the interrupt handlers receives data (1 byte) from a USB device about 200 times a second. I would like to store this data with a time stamp on each sample...
As always after some research I was unable to find anything of real value. My question is how does one go about handling exceptions in a real time system? As program failure generally is not the best case i.e. nuclear reactor/ heart monitor. Ok since everyone got lost on the second piece of this, which had NOTHING to do with the mai...
I am trying to get all output from child process in real time. I use spawn for creating child process but I am confused what I should send for pattern parameter in expect function. Actually I don't understand why it's not an optional parameter. I don't know if I should use send(), child doesn't need input. I'm just trying to write outpu...
Hello, For one of our project, we need to pull huge real time stock data from 4 remote servers across two countries. The trivial process here, check the sources for a regular interval and save the update to database. But as these are real time stock data of more than 1000 companies, I have to pull every second, which isn't good in case...
I'm going to write a program that plots data from a sensor connected to the computer. The sensor value is going to be plotted as a function of the time (sensor value on the y-axis, time on the x-axis). I want to be able to add new values to the plot in real time. What would be best to do this with in C++? Edit: And by the way, the progr...
I've found a lot of programs and scripts for counting the number of lines of code using Google, but what I'm looking for is something that graphs it in real time. I'm hoping this will motivate myself and other programmers. Any ideas? ...
The only reason I could think of for using RTP to transfer a pre-existing file is if you're trying to monitor the amount of time a user is streaming the file, like if you're running a time-based On-Demand website. The other streaming-solution i know of is to use HTTP to upload a media file, then providing a client to progressively play t...